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arXiv · 2507.06454

Dark Walker in the Early Universe: A Strongly Coupled Sector Model

Chen Yang
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Abstract

We explore the phenomenology of the ``Dark Walker'' -- an $\text{SU}(3)$ theory with eight flavors of massless fundamental fermions in the dark sector. During inflation, its walking dynamics generate primordial non-Gaussianities through the exchange of unparticles, while accounting for the current dark matter relic abundance if we consider freeze-in of Dark Walker coupled to the Standard Model through the Higgs portal. This provides a simple yet predictive example linking strongly coupled inflationary dynamics to present-day dark matter.

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Chen Yang. 2025-07-08. Dark Walker in the Early Universe: A Strongly Coupled Sector Model. https://doi.org/10.1016/j.physletb.2025.140073

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